Redisplaying a form!
Posted: 22. May 2009 21:32hi all,
I am trying to check whether a username is already present in my 'users' table and doing validation in both the JavaScript and in the form processing. but I m receiving an error when i run the code below:
The error I receive is:
Fatal error: Call to a member function query() on a non-object in RedisplayForm.php on line 65.
Line 65 in the above code is : $result = $connection->query($query);
Please suggest some solution or direct me to the right path where i can find the solution! please note am a beginner in php.....so plz suggest simple solutions! thanx!
I am trying to check whether a username is already present in my 'users' table and doing validation in both the JavaScript and in the form processing. but I m receiving an error when i run the code below:
- Code: Select all
<html>
<head>
<title>Sample Form</title>
<script type="text/javascript" src="source.js"></script>
<script type="text/javascript">
function check_valid(form)
{
var error = "";
error += verify_username(form.username.value);
error += verify_password(form.password.value);
error += verify_phone(form.phone.value);
error += verify_email(form.email.value);
if (error != "")
{
alert(error);
return false;
}
return true;
}
</script>
</head>
<body>
<?php
// Check for form post submit
if ($_POST["submit"])
{
require_once('db_login.php');
require_once('DB.php');
$connection = DB::connect("mysql://$db_username:$db_password@$db_host/$db_database");
if (DB::isError($connection))
{
die ("Could not connect to the database: <br />". DB::errorMessage($connection));
}
// Remember to use htmlentities to prevent cross-site scripting vulnerabilities
$username = $_POST["username"];
$username = mysql_real_escape_string(get_magic_quotes_gpc( ) ? stripslashes($username) :
$username);
$password = $_POST["password"];
$password = htmlentities(get_magic_quotes_gpc( ) ? stripslashes($password) : $password);
$email = $_POST["email"];
$email = htmlentities(get_magic_quotes_gpc( ) ? stripslashes($password) : $password);
$phone = $_POST["phone"];
$phone = htmlentities(get_magic_quotes_gpc( ) ? stripslashes($phone) : $phone);
$error = "";
}
if (is_null($username == ""))
{
$error .= "Username must not be null.<br />";
}
if ($password == "")
{
$error .= "Password must not be null.<br />";
}
if ($email == "")
{
$error .= "Email must not be null.<br />";
}
if ($phone == "")
{
$error .= "Phone must not be null.<br />";
}
// Query the posts with categories and user information
$query = "SELECT * FROM users WHERE username='$username'";
// Execute the database query
$result = $connection->query($query);
if (DB::isError($result))
{
die("Could not query the database: <br />".$query." ".DB::errorMessage($result));
}
$user_count = $result->numRows( );
if ($user_count > 0)
{
$error .= "Error: Username $username is taken already. Please select another. <br />";
}
if ($error)
{
echo $error;
}
else
{
echo "Username is available.";
exit;
}
?>
// This script will process the results as well as display the form
<form action="<?php echo htmlentities($_SERVER["PHP_SELF"]); ?>" method="POST"
onsubmit="return check_valid(this);" id="test1" name="test1">
<table>
<tr>
<td width="30%" align="right">Username:</td>
<td><input type="text" name="username" value="<?php echo ($username); ?>" /> </td>
</tr>
<tr>
<td align="right">Password:</td>
<td><input type="password" name="password" value="<?php echo($password); ?>" /> </td>
</tr>
<tr>
<td align="right">Phone:</td>
<td><input type="phone" name="phone" value="<?php echo($phone); ?>" /></td>
</tr>
<tr>
<td align="right">Email:</td>
<td><input type="email" name="email" value="<?php echo($email); ?>" /></td>
</tr>
<tr>
<td> </td>
<td><input type="submit" name="submit" value="Submit" /></td>
</tr>
</table>
</form>
</body>
</html>
The error I receive is:
Fatal error: Call to a member function query() on a non-object in RedisplayForm.php on line 65.
Line 65 in the above code is : $result = $connection->query($query);
Please suggest some solution or direct me to the right path where i can find the solution! please note am a beginner in php.....so plz suggest simple solutions! thanx!